Hi! This is Seeker and I have been playing League of Legends for a long time and it took the most part of my day and this is my first guide. I'm quite familiar with BBCode but still read jhoijhoi's famous guide on how to make a guide. English it's not my main language and I'm crafting this guide because I like typing/speking english and Poppy is a fabulous champion.
Poppy is quite underplayed mainly 'cause her price (450 IP). I can say to you never judge a champion basing on their prices. Good examples of champions that, in my opinion, are worth the price are Akali and Katarina. Some of you may not agree with my opinion, but it is personal. The reason they are REALLY worth is the high burst capability, which make them great assassins and should be more expensive such as Fizz or LeBlanc (4800 and 6300 IP, respectively).
Any grammar or spelling errors you find, please let me know and I don't care if you downvote this, just let me know too what I should improve (e.g: BBCoding, bad build and the reason, etc.)

First of all, you all must study a champion before buying it just to be sure that it won't be a waste of hard time getting IP. Doesn't exist a bad champion, they all are good so far, you just need to know how to play it properly and it's not diferent with Poppy.
She can be played in three ways: AD, AP and Hybrid. This guide will cover only the hybrid Pop.

Devastating Blow(Q) - It's responsible for most part of the burst. Has an insane damage bonus. Never understimate the power of your Q. Avoid using this on minions, use it only on champions.

Paragon of Demacia(W) - Help you chase enemies and escape team fights. If needed, combo it with Ghost summoner spell.

Heroic Charge(E) - Your engage spell, use it carefully. What's good on this ability is the stun if you hit a wall while using it. I personally think that the good using of this differs the good from the bad Poppy player. I'm not saying that if you miss one time the stun you suck. Errors may occur, but it's primordial hit the stun. 1.5 seconds is only what you need to get the kill if not a tank.

Diplomatic Immunity(R) - YOUR MOTHERFU**** ULTIMATE! Awesome for tower diving or survive on team fights. The only one allowed to deal damage is the person you targeted. Logically, you don't want to ult on a fed Master Yi. Target the support or the weakest, so only him can deal you damage. Once you ultimated, go on without fear, even towers will not affect you!

Pros

+ Great Burst with Devastating Blow + Nice Engage with Heroic Charge + Can easily pulverize ADCs and APCs + Nice Burst + Almost no gold spent with survability items + Tower dive capability with her ult Diplomatic Immunity + Great chasing with Paragon of Demacia

Heroic Charge is a good engage skill because of the stun if you hit a wall. It deals good AP damage and stun and paper champions (ADCs and APCs) are killed so easily by Poppy due to her burst and the passive Valiant Fighter guarantees good survability and Diplomatic Immunity makes you recieve damage only from the champion you targeted. Use this in teamfights, target the weakest enemy and kill the most enemies possible while Diplomatic Immunity is active.

Cons

- Pretty high cooldowns - Tower dive and survability on TFs depends of Diplomatic Immunity - Squishy - No built-in escape - Huh... Can you remember me how will I desengage team fights if things get bad?

Poppy is an assassin with pretty high CDs and like many other assassin champions, what really makes her a good assassin is Diplomatic Immunity (e.g.: One of the deadly tools Akali have is Shadow Dance which is secondarily a gap closer, while Katarina's Death Lotus is used to finish off a champ). As you can see, they have two different ult's with two different purposes. Diplomatic Immunity gives you time/assistance to kill enemies being as useful as Shadow Dance and Death Lotus

This spell is quite unusual on League of Legends, 'cause many prefer Flash and not Ghost. Poppy exceptionally will be more efficient with ghost spell 'cause it can combo with Paragon of Demacia making almost impossible escape or catch her.

You can use this too, but only with Ghost, will provide a more efficient escape/catch because the capability of trespassing walls.

Use Ignite to play more aggresively and/or if you are facing off great sustained champions such as Yorick, Fiora and Duelist or Irelia with her Hiten Style

Teleport is situational, if you see that the enemy team have ranged champions like Teemo which will not let you farm or push the lane, use it to prevent the destruction of the top tower or the other lanes ones.
( Teemo is only an example, he's not really a problem for you, with the right timing and skills, he can be killed easily)

I think these ones are the only viable spells for Poppy, if you use any other, please let me know and I will add credits to you.

As you saw in the Pros/Cons chapter, Poppy is a solo top champ and is squishy and top soloers must be tanky, so, it's important to invest in some armor. Poppy's spells scale with AD and others with AP, I like playing her hybrid for a good damage in all skills. This build basically will make a Poppy completely hybrid, not only on damage attributes.

philosopher's stone I only take this because of the mana and hp regeneration to give more sustain and the passive will help you start building Poppy, sell this when you need more space for items.

Boots are always situational, I usually take this one to help building a tanky Poppy, and it's good due to it's passive that reduces the duration of CCs. You can always take Ninja Tabi or Sorcerer's Shoes whenever you need.

It's a hybrid item that I always buy while playing Akali too, his active can sometimes secure the kill.

Will help building a tanky Poppy too. Gives tons of health.

Kind of a hybrid item, gives you a little of everything, just what Poppy needs.

Gives you a boost on the ASPD, Mov. Speed and Critical.

Helps a lot, it gives you armor and more critic chance, but that's not the point. What I really like on this item is the passive: it will give you a bonus on your AD based on your HP (1,5% of it). It's not a lot, but since you're building a tanky Poppy with tons of HP, 1,5% can mean a lot.

Situational Items

As you may know, you may change your build based on who you are facing on top lane or even in the whole game. Boots are a good example. Why would you make a Ninja Tabi if the whole team scales with AP? It will be useless, that's why I made a extra section on the build. And here I'll help you how to figure out when you have to switch the build's items.

Take this if you are facing a powerful champion which scales with AD like Jax or Tryndamere or if you notice that the entire team or most part of it are AD and don't have much CC, change it. You'll face them often on top lane. Only buy it if you really find out you need extra armor, 'cause you can still use Mercury's Treads even facing those champions, just be careful.

and Take those two if you get fed and replace Warmog's Armor and Atma's Impaler since Atma's Impaler needs Warmog's Armor to give you a decent bonus. If you want only one of them in your build, choose the one you need more and replace Atma's Impaler with it.

Sice I don't have a lot of experience on League of Legends, I won't be able to give precise information for you about runes.

Seal of Armor x9 - As I said many times, you have to be a tanky Poppy if you want to solo top.

Greater Glyph of Scaling Cooldown Reduction x9 - Poppy sometimes can easily be killed in team fights when her skills are on cooldown and when this happens, Diplomatic Immunity can save you. But what if even your ultimate is on cooldown? To prevent that, take some CDR, so you can spam Devastating Blow and Heroic Charge more often.

Greater Quintessence of Movement Speed x3 - Since Poppy has great chase and escape with Paragon of Demacia, why don't increase even more her MS? If things get really bad on team fights or if you want to go for a quadra or pentakill and your opponent is running, use Paragon of Demacia and Ghost to get the kill. The speed is already very fast. This rune will increase even more you MS and can save your life or give you a kill.

Mark of Attack Damage x9 - If you have the opprtunity to be tanky and can still take more damage, do it. That's why this mark is my chosen one.

First maximize Devastating Blow to increase the amount of burst, and then your secondary skill damage-dealer - Heroic Charge remembering to put a point on Diplomatic Immunity everytime you can. Maximize Paragon of Demacia last.

There's not much to explain, just a basic tip to any solo top: farm A LOT. Get an level advantage and go on: Heroic Charge to stun, Devastating Blow and keep auto attacking. Before combo on you enemy, wait for a chance to do it to get him unwarned, for example, while he is last hitting a minion or if he waste an important skill on a minion (like Fizz's "E", it's a vital skill for him) once you know that skill is on cooldown, combo. You won't get the kill, but if he's dumb enough to trade with you, he's dead. Use your Q whenever it's available and stun if possible and do not hesitate using Ignite to secure the kill.

Hi everyone again! Hope you enjoyed my guide. I don't think it's awesome but it's not that bad. I could make a guide for the Brazilian Community, but you may not know but there are many ignorants that don't actually know how to constructively critic a guide. But there I saw many of you always saying what to improve and this really encouraged me to write a guide! I had a lot of fun making this, so please, rate it! Comment what to change!

I'm out, peace.